2 literature references for Stelligera nux Lendenfeld, 1897:

Author: Van Soest, R.W.M.
Year: 2001
Title: Porifera, in: Costello, M.J. et al. (Ed.) (2001).
Source: European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50:
Author: Lendenfeld, R. Von
Year: 1897
Title: Die Clavulina der Adria.
Source: Nova acta Academiae Caesareae Leopoldino Carolinae germanicae naturaecuriosorum 69: 1-251, pls I-XII.